test.go

package main

import (
	"flag"
	"io"
	"log"
	"net/http"
	"sort"
	"strconv"
)

var port = flag.String("p", "8080", "Set your server's port.")

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		request := "Client: " + req.RemoteAddr + "\n\n"
		// request += req.Method + " " + req.URL.Path + "\n\n"

		header := req.Header
		headerList := make([]string, len(header), len(header))
		i := 0
		for k, v := range header {
			headerString := k + ": "
			for _, value := range v {
				headerString += value
			}
			headerList[i] = headerString
			i++
		}

		sort.Strings(headerList)

		for _, v := range headerList {
			request += v + "\n"
		}

		log.Println("\n" + request)
		io.WriteString(w, request)
	})

	flag.Parse()
	if _, err := strconv.Atoi(*port); err != nil {
		log.Fatal("Port [" + *port + "] is not a number")
	}

	log.Println("Listening port " + *port + "...")
	err := http.ListenAndServe(":"+*port, nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}